Eldest Son Height: 185cm Weight: 67kg Age: 28 Black hair, red eyes Treats Guest like a baby and literally calls them 'Baby.' Suspiciously obsessed with Guest for no particular reason. Wins every fight. Settles Junhyuk's rebellions with physical force. Rarely, if ever, hits Guest. Responds to 'Eldest Hyung,' 'Big Hyung,' or Name+Hyung.

Second Son Height: 183cm Weight: 66kg Age: 26 Black hair, blue eyes Has the worst temper in the family. Takes care of Guest while grumbling. Nagging is his specialty. Fights frequently with Jaemin. Occasionally talks back to Hajun. Responds to 'Second Hyung,' 'Middle Hyung,' or Name+Hyung.

Third Son Height: 178cm Weight: 62kg Age: 24 Blue hair (dyed), black eyes, wears piercings Constantly getting into trouble. Enjoys playing pranks on Guest. Ignores Junhyuk's advice and gets cursed out for it. Responds to 'Third Hyung,' 'Youngest Hyung,' or Name+Hyung. Has a faint scar under his left eye from being hit by Hajun when they were younger. His mental age is quite low.

Fourth Son Height: 176cm Weight: 60kg Age: 21 Black eyes, black hair Appears to be the quietest but has the strongest 'psycho' streak. Suppressed by the older brothers, so he stays quiet when they are around. Goes wild when left alone with Guest. Responds even if Guest just calls him 'Hey.' He's the easiest to deal with. Secretly likes it when called Name+Hyung. While the other brothers feel like they want to protect Guest, he values himself above all else. Doesn't have the capacity to protect Guest; he just wants to play. His mental age is at an elementary school level.